Process of making compressed fiber board



Patented June 24, 1924.

QNETEE STATES HERMAN M. CAS'INER, OF NO'BLE BQRO, MAINE.

PROCESS OF MAKING COMPRESSED FIBER IBOARD.

No Drawing.

To all whom it may concern:

Be it known that I, HERMAN M. CAsrNER, a citizen of the United States.and resident of Nobleboro, in the county of Lincoln and State of Maine,have invented certain new and useful Improvements in Processes of MakingCompressed Fiber Board, of which the following is a specification.

My present invention relates to an im- 1 proved product or article ofmanufacture which I term Ivory fiber board and to the process of makingthe same.

The invention aims to produce a product which may be used as a leathersubstitute in the manufacture of white shoes, though not limited to thisuse, and which will be flexible and elastic and free from all danger ofsplitting or cracking.

Th invention further aims to provide a product which may be built upinto a number of layers or laminations which will be permanently unitedand free from all danger of separating.-

A further object is to secure a product which will retain its originalcolor appearance for an indefinite period.

Hth these and other objects in vieW, the invention includes the novelproduct and process hereinafter described and particularly defined bythe appended claims.

In proceeding according to my improved process I take bleached whitesulphite wood pulp of the best quality, to which is added about ten percent of paraflin paper or any form of paraffin waste. This is mixed withwater and beat into a pulp by a power heater for the period of an houror more, depending upon the condition of the material. From there itpasses into an agitator tank Where fifty per cent of water is added andthe whole thoroughly mixed. It is further put through two centrifugalpumps to get it properly mixed and of the right consistency, passing bymeans of the pumps into a tank which supplies the material for what isknown as a wet machine. This is the machine on which the board is madeas later described.

At this point one hundred per cent of water is added and the wholemixture is then picked up by a wire-covered cylinder, passed on to afelt and press roll until roll has accumulated thereon a substance ofApplication filed August 8, 1921. Serial N o.490,759.'

proper thickness, when it is cut oil, taken from roll and next passed tothe dry room.

Three tons of the board as taken from the cylinder produces about oneton of finished product after it has been dried and tempered. In the dryroom it is placed upon racks made of wire screening, one sheet upon arack, these racks being about an inch apart, and dried in a moistatmosphere. which prevents the material from becoming hard and brittleso that it will split in the nailing. or in other words, makes itflexible and elastic. If the board is too soft, it will separate intolayers, and if it is too hard it will split in the nailing, but themoist air in drying is What makes it tough, flexible and of the rightconsistency.

The board is finished by being run through hydraulic rolls under severaltons 7 pressure. When finished it is dry, but

tough, flexible and elastic.

The mixture of material makes a fast ivory color which will not changeexcept as the. ivory takes a somewhat deeper shade by age.

The drying is preferably done by steam .in a large room well ventilated,with fans to keep up a circulation of air. It is dried evenly, so thatthe finished board will not curl up.

I claim:

1. The herein described method which consists in commingling sulphitewood pulp with approximately ten per cent of parafiin and water,thereafter adding additional water to the mass and thoroughly agitatingthe same. adding further water, and then forming the mixture intosheets, drying the sheets in a moist atmosphere, and subjecting thesheets to pressure.

2. The herein described method which consists in mixing bleached whitesulphite wood pulp with approximately ten per cent of paraffin in thepresence of water, thoroughly agitating the mixture in the presence ofadditional Water, forming the mixture into layers, drying said layers ina moist atmosphere, and subjecting the same to pressure.

In testimony whereof, I afiix my signature.

HERMAN M. CASTNER.

